Crunchyroll.com is a good one, if you sign up(free), you can also have a favourites list so you can keep track on which episode you want to watch next and there is a "popular" section that shows the anime that is popular at the moment
Actually it's been a while since I was back into watching animes! So atm I'm in a Anime Otaku mood!!! xD I'm watching my animes on "Animecrazy" it's got animes & J-dramas/k-dramas etc
So recently the new animes I've been watching is
-Magi; the labyrinth of magic (still airing)
-Swords Art Online ( still airing too)
Other animes recommended just yesterday (for me xD) were
-Darker than black
-Guilty crown
-Gunslinger girls
-Beserk
-Ghost hunt
Well it also depends on what genre you like I suppose :3
I usually go on 'anime here' and 'anime freak' but some times I just go on to any old site (NOT HENTAI!!) But sorry dude even I'm still trying to find some new anime...Honestly I think I'll just watch 'Inuyasha' again so if you haven't seen that try it out.